I had to laugh when during the livestream they were going through each of the innovations of their past systems, and the only thing they could mention about the Gamecube was that it had a handle :) But overall I think they continue to show real innovation in gaming. They're the only company who puts so much effort into maximizing their software with the uniqueness of their hardware.
The Wii was basically just a higher-clocked (~2x CPU and GPU) Gamecube—much more like the XBO S or the PS4 Pro are for this generation, than like the architectural reinventions Nintendo usually gets up to. The fact that it seemed like a whole new console with new capabilities for games, is more than anything a statement of how much untapped potential there still was in the Gamecube's architecture at the end of its life, that Wii developers went on to find.